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redirect output into the middle of a file

 
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# 1  
Old 12-18-2009
redirect output into the middle of a file
If I want to cat one file and have the output inserted into a specific place on another file, how is this done? I know how to append >> and to overwrite > but say I have a file with:

File1:
abc
def
ghi
jkl


And a File with:

File2:
mno
pqr
stu
vwx

And I want to place the contents of file one between the pqr and stu lines of file 2, how do i do it?
# 2  
Old 12-18-2009
well, if you know exactly where you want to insert stuff into the 2nd file,
and the files aren't too large:

Code:
vi +/pqr file_nm << EOF
:r other_file_nm^M
:wq^M
EOF

Where the ^M is entered using vi with CONTROL-V, ENTER

Redirect the output to /dev/null, if you don't want to see it work.

Another way might be:

Code:
(
sed -n '1,/pqr/p' file_nm
cat other_file_nm
sed -n '/stu/,$p' file_nm
) > file_nm.mangled

Then rename the mangled file.
# 3  
Old 12-18-2009
Tools if you know where to break the file
Code:
head -2 file1 ; cat file2 ; tail -2 file1

or, to send to a file
Code:
head -2 file1 >outfile ; cat file2 >>outfile ; tail -2 file1 >>outfile

# 4  
Old 12-18-2009
for really large files:
Code:
start=12443 
awk -v ins=$(< filetoinsert) -v start=$start '{if(FNR==start) {print; print ins}
                                                           else {print} }' inputfile > newfile

# 5  
Old 12-18-2009
Code:
gawk 'FNR==NR{ s[++d]=$0;next}
/pqr/{
    print
    for(i=1;i<=d;i++){  print s[i]  }
    next
}{print}
' file1 file2

# 6  
Old 12-18-2009
Code:
sed '/pqr/rfile1' file2

 
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